The Maricopa County Attorney’s Office filed notice before today’s deadline that it will seek the death penalty for Saucedo. If convicted he would become tied as the most prolific serial killer in Arizona history.

The Maryvale Shooter, as the killer was popularly known as his rampage of drive-by shootings in that neighborhood escalated in summer 2016, is believed to have killed nine people in a dozen shootings.

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June 3: Horacio de Jesus Pena, 32, killed outside his house at 6700 West Flower Street.

June 10: Manuel Castro Garcia, 19, shot to death outside his house, near 6500 West Coronado Road.

June 12: Stefanie Ellis, 33, and her 12-year-old daughter, Maleah, shot to death outside their home near 6300 West Berkley Road. Friend Angela Linner, 31, shot and later died.

Records released to date show that police have built their case on similarities between bullet fragments and shell casings found at the scene of the crimes and the guns Saucedo had at the time. There are also similarities with bullet casings found in cars he was driving at the time.

Sean Holstege is a freelance reporter with a 30-year career in print news. He was an investigative reporter at The Arizona Republic and the Oakland Tribune. He won a Sigma Delta Chi award for investigative reporting. He’s covered transportation, terrorism, the border, disasters, child welfare, courts, and breaking news.